S0917 Robotic-Assisted Endoscopic Submucosal Dissection of Distal Colon and Rectal Lesions

Abstract

INTRODUCTION: Endoscopic submucosal dissection (ESD) and endoscopic full-thickness resection (EFTR) are therapeutic alternatives to surgery for resection of colon and rectal lesions. In regards to large colon and rectal polyps and tumors, both ESD and EFTR have high en bloc resection rates and low recurrence rates, but are limited by training, procedure length, stability, and instrumentation. The Robotic System (RS) is a new robot-assisted endoscopic platform with multiple degrees of freedom allowing improved visualization, dexterity, and tissue manipulation with traction. This is the first U.S. experience assessing the feasibility and safety of robot-assisted ESD and EFTR in resection of distal colon and rectal lesions and its implication for polyps and tumors. METHODS: This is a multicenter retrospective study from five institutions. Patients with distal colon or rectal lesions who underwent either ESD or EFTR with the RS were included. Each patient’s clinical history, endoscopic findings, procedural records, and pathology records were reviewed. RESULTS: Forty-one patients underwent either ESD or EFTR with the RS for distal colon or rectal lesions, with an average total resection time of 135.0 minutes (σ 62.8, n = 24). On average, lesions were 9.3 cm from the anal verge (range: 2 cm to 17 cm, n = 35) and were 30.0 mm in max diameter (range: 9 to 77 mm, n = 28). There were 13 (31.7%) neoplasms and 23 (56.1%) adenomatous polyps; other lesions included inflammatory polyps, diffuse nodular lymphoid hyperplasia, and granulation tissue—all were suspicious for malignancy. Neoplasms included 11 adenocarcinomas and 2 GISTs. Adenomatous polyps included 11 tubular adenomas and 11 tubulovillous adenomas. Twenty-nine out of 34 patients (85.3%) with either adenomatous polyps or adenocarcinoma were successfully removed with the RS alone. Of these, 23 (79.3%) demonstrated clean margins on pathology. Post-endoscopic complications included rectal pain and bleeding. CONCLUSION: This report demonstrates a role of robotic endoscopy for the safe and effective treatment of natural orifice endoscopic surgical resection, with its benefits including traction and triangulation. As endoscopic surgery in the form of ESD evolves, refinement of the tools and techniques of the robotic platform will allow endoscopists to have shorter learning curves and resection of distal colon and rectal polyps and tumors to have higher negative margin rates, potentially allowing more endoscopists the ability to perform ESD.Figure 1.: The robot-assisted endoscopic platform.Table 1Table 2